Tsisaryk O. Metabolism and biochemical composition of milk in cows fed with rapessed

The object: metabolism, milk composition, biological value, physical and biochemical properties of dairy products (butter). The aim: to establish the effect of feeding cows of different levels of milk production and physiological state (during lactation and dry period) with rapeseed on their metabolism and milk productivity, to explore the extent of the modification possibilities of rapeseed’s lipid complex on the fatty acid composition in milk, biological value of milk fat and properties of the dairy product (butter). Methods: biochemical (analytical, chromatographic, electrophoresis), immunological, rheological, organoleptic, statistical analysis. Novelty: the influence of feeding rapeseed on some metabolism links and secretory activity of mammary gland in cows of different levels of productivity and physiological state as a result of complex investigations. The optimal form of rapeseed for feeding cows and the optimal amount of seeds in the cows' diet were experimentally found. The investigation of digestion and assimilation of nutrients and metabolism in cows under the feeding of rapeseed received further developement. For the first time, we demonstrated the modification effect of feeding rapeseed on the isomeric forms of fatty acids in blood lipids and milk. For the first time, we explored the properties of butter obtained from the milk of the cows fed with rapeseed and defined the positive role of rapeseed on the natural chain: feed - animal - milk - the dairy product.